Ruthenium(II)-Catalyzed Hydrogenation and Tandem (De)Hydrogenation <i>via</i> Metal–Ligand Cooperation: Base- and Solvent-Assisted Switchable Selectivity
作者:Rahul Daga Patil、Sanjay Pratihar
DOI:10.1021/acs.joc.2c01965
日期:——
carbonate)-assisted switchable synthesis of saturated ketone and α-methyl saturated ketone from α,β-unsaturated ketone is developed. Mechanistic aspects, evaluated from spectroscopic studies, in situ monitoring of the reaction progress, control studies, and labeling studies, further indicate the involvement of a tandem dehydrogenation–condensation–hydrogenation sequence in the reaction, in which the interconvertible
开发了一种多功能、选择性、溶剂(甲醇与乙醇)和碱(钾与碳酸锂)辅助的从 α,β-不饱和酮可切换合成饱和酮和 α-甲基饱和酮的方法。通过光谱研究、反应进程原位监测、对照研究和标记研究评估的机理方面,进一步表明反应中涉及串联脱氢-缩合-氢化序列,其中可相互转换的配位模式(亚氨基N→咪唑与 Ru(II)-对伞花烃配位的 Ru 和酰胺基 N-Ru) 至关重要,否则催化剂的效率和选择性将完全丧失。该催化剂表现出良好的效率、选择性和官能团耐受性,并且在不饱和查耳酮的单甲基化和氢化、酮的双甲基化和胺的N-甲基化方面表现出广泛的范围(69 个实例)。